[TOC] ### 通用的異步 eval() 在 worker 內使用 eval() 來按順序執行異步的任何種類的 JavaScript 代碼 ``` var asyncEval = (function () { var aListeners = [], oParser = new Worker("data:text/javascript;charset=US-ASCII,onmessage%20%3D%20function%20%28oEvent%29%20%7B%0A%09postMessage%28%7B%0A%09%09%22id%22%3A%20oEvent.data.id%2C%0A%09%09%22evaluated%22%3A%20eval%28oEvent.data.code%29%0A%09%7D%29%3B%0A%7D"); oParser.onmessage = function (oEvent) { if (aListeners[oEvent.data.id]) { aListeners[oEvent.data.id](oEvent.data.evaluated); } delete aListeners[oEvent.data.id]; }; return function (sCode, fListener) { aListeners.push(fListener || null); oParser.postMessage({ "id": aListeners.length - 1, "code": sCode }); }; })(); // 異步計算 asyncEval("3 + 2", function (sMessage) { alert("3 + 2 = " + sMessage); }); // 異步添加DOM asyncEval("\"Hello World!!!\"", function (sHTML) { document.body.appendChild(document.createTextNode(sHTML)); }); ```